Could you please elaborate on how payment is processed on Bubble? I'm curious about the specific mechanisms involved in the financial transactions within the platform. Do users receive payments directly into their bank accounts, or are there intermediate steps involved? Additionally, what are the payment options available for both buyers and sellers on Bubble? Is there a fee associated with the payment process, and if so, how is it calculated? Lastly, could you provide any insights into the security measures taken by Bubble to ensure the safety and security of financial transactions?